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LIKE vs CONTAINS on SQL Server
...al execution plan fetching over 200,000 records. Putting both queries in a batch, both scanned the clustered index, but in addition the "CONTAINS" query does have an added cost of FULL TEXT MATCH and a MERGE JOIN.
– MI C
Mar 1 '14 at 20:14
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Cluster analysis in R: determine the optimal number of clusters
...t.obj)
css.obj <- css.hclust(dist.obj,hclust.obj)
elbow.obj <- elbow.batch(css.obj)
k <- elbow.obj$k
return(k)
}
Running Elbow parallel
no_cores <- detectCores()
cl<-makeCluster(no_cores)
clusterEvalQ(cl, library(GMD))
clusterExport(cl, list("data.clustering", "data.con...
Distributed sequence number generation?
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i like your point about the batch id generation, but it just limits any real time calculation possibility.
– ishan
Jul 10 '15 at 18:19
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What exactly is metaprogramming?
... then eval it) or to emit another language (using .NET to create a windows batch file).
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What does “Auto packing the repository for optimum performance” mean?
...press) objects, so Git initially creates loose objects, then packs them in batches now and then, via automatic invocation of git gc --auto.
If you let Git finish repacking, this won't happen again for a while. It can indeed take a while, especially if you have a lot of large binary objects, but if ...
Is std::vector so much slower than plain arrays?
... You are doing 1 000 000 000 array accesses. The time difference is 0.333 seconds. Or a difference of 0.000000000333 per array access. Assuming a 2.33 GHz Processor like mine that's 0.7 instruction pipeline stages per array accesses. So the vector looks like it is using one extra instruction pe...
Write a program to find 100 largest numbers out of an array of 1 billion numbers
... QuickSelect again. Continue until you have run though the entire input in batches of 100.
At the end you have the top 100 values. For N values you have run QuickSelect roughly N/100 times. Each Quickselect cost about 200 times some constant, so the total cost is 2N times some constant. This looks ...
Find size of Git repository
... files in the repo history:
git rev-list --objects --all | git cat-file --batch-check="%(objectsize) %(rest)" | cut -d" " -f1 | paste -s -d + - | bc
You can replace --all with a treeish (HEAD, origin/master, etc.) to calculate the size of a branch.
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Can I install Python 3.x and 2.x on the same Windows computer?
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I'm using 2.5, 2.6, and 3.0 from the shell with one line batch scripts of the form:
:: The @ symbol at the start turns off the prompt from displaying the command.
:: The % represents an argument, while the * means all of them.
@c:\programs\pythonX.Y\python.exe %*
Name them pytho...
What's wrong with foreign keys?
...sually a good thing). This is especially painful when you are doing large batch updates, and you load up one table before another, with the second table creating consistent state (but should you be doing that sort of thing if there is a possibility that the second load fails and your database is no...